CODEWITHSUNDEEP
pythonfunctionnumpylambdasympy
Simplex
Simplex

Reputation: 63

Calculating values of an array by applying a SymPy function results in AttributeError

I have an array of numbers of which I want to calculate values with a simple equation. 

import numpy as np
import sympy as sym

x_values = np.linspace(0, 2, 100)
function = lambda x : 10*sym.sin(9*x)
function(x_values)

I get:

 AttributeError: 'ImmutableDenseNDimArray' object has no attribute 'could_extract_minus_sign'

Upvotes: 2

Views: 413

Answers (2)

I_Al-thamary
I_Al-thamary

Reputation: 3993

You should define a function 

  import numpy as   np
    import sympy as sym
    x_values = np.linspace(0, 2, 100)
    def function(x):
         lambda x : 10*sym.sin(9*x)
         return x

    print(function(x_values))

The code:http://tpcg.io/cBEnHu or you can do this

import numpy as np
from sympy import sin
import pylab as pl
from sympy.abc import x
from sympy import Function
from sympy import *
x_values = np.linspace(0, 2, 100)


function = lambdify(x, 10*sin(9*x))
print(function(x_values ))

The code:http://tpcg.io/cBEnHu

Upvotes: 0

Ista
Ista

Reputation: 10437

You can do this using sympy.lambdify, like this:

import numpy as np
import sympy as sym

x = sym.symbols("x")
x_values = np.linspace(0, 2, 100)
function = sym.lambdify(x, 10*sym.sin(9*x), "numpy")
function(x_values)

Upvotes: 2

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